Mermaid2aichat DSH

Key features

• in-page fullscreen (⧉) when the canvas needs room
• Chat area yields + resizable width: a DOM layout controller appends an editor column to the shell grid — the chat auto-shrinks and is never occluded
• drag the handle to resize (300–1200px, chat always keeps ≥400px), double-click to reset
• Coexists with the dsh sidebar, the session details column, and dsh-web-ui's right panels (see "Coexistence protocol")
• Responsive compact modebelow 420px the side panels hide, leaving only the canvas